This is a Midwest Industries Accessory known as the M-LOK Rail Section, model MI-9MR.
When it comes to upgrading your trusty black gun for your next mission" hunting trip" competition" or range use" Midwest Industries should be on your short list of considerations for high quality components. Midwest Industries is well respected in the industry for giving shooters some of the very best gear available anywhere. The AR-15 M-LOK 1913 Mil Spec Rail Section is another in a long line of excellence that has established Midwest Industries as leader in the industry. If you choose to go with Midwest Industries" you will be going with one of the most reliable and durable in the industry.
Features:
Nine slot 1913 Mil-Spec Rail Section
M-LOK compatible
Mounting hardware included